 <template>
  <view class="viewport">
    <!-- 推荐封面 -->
<view class="cover">
  <image :src="bannerPicture"></image>
</view>
    <!-- tab栏 -->
<view class="tabs">
  <text
    class="text"
    v-for="(item, index) in recommendList"
    :key="index"
    :class="{ active: index === activeIndex }"
    @tap="activeIndex = index"
  >
    {{ item.subTypes.title }}
  </text>
</view>
    <!-- 列表内容 -->
    <scroll-view
      scroll-y
      class="scroll-view"
      @scrolltolower="handleScrolltolower"
      v-for="(item, index) in recommendList"
      :key="index"
      v-show="activeIndex === index"
    >
      <view class="goods">
        <navigator
          hover-class="none"
          class="navigator"
          v-for="goods in item.goodsItems.items"
          :key="goods.id"
          :url="`/pages/goods/index?id=${goods.id}`"
        >
          <image class="thumb" :src="goods.picture"></image>
          <view class="name ellipsis">{{ goods.name }}</view>
          <view class="price">
            <text class="symbol">¥</text>
            <text class="number">{{ goods.price }}</text>
          </view>
        </navigator>
      </view>
      <view class="loading">正在加载...</view>
    </scroll-view>
  </view>
</template>

<script>
import { getHomeRecommend } from "@/http/home";
export default {
  data(){
  return  {
      // 背景大图
      bannerPicture: "",
      // 当前显示的tab栏
      activeIndex: 0,
      // 列表数据
      recommendList: [],
}
  },
async onLoad({type}){
    // 存放页面的标题和获取的url
     const urlMap = {
      1: { title: "特惠推荐", url: "/home/preference/mutli" },
      2: { title: "爆款推荐", url: "/home/inVogue/mutli" },
      3: { title: "一站买全", url: "/home/oneStop/mutli" },
      4: { title: "领券中心", url: "/home/new/mutli" }, // 后端未提供，暂用新鲜好物url
      5: { title: "新鲜好物", url: "/home/new/mutli" },
    };
    // 获取当前type对应的数据
    this.currentInfo = urlMap[type]

    //动态设置页面标题
    uni.setNavigationBarTitle({title:this.currentInfo.title})

    //发送请求获取对应的数据
   const res =  await getHomeRecommend(this.currentInfo.url)
   console.log(res);
  //  背景大图
   this.bannerPicture = res.result.bannerPicture
  //  构造数据列表
  this.recommendList = res.result.subTypes.map(v=>{
    // id 是 subTypes 里面的id 和 goodsItems的下标相对应
    const id = v.id
    return {
      subTypes:v,
      goodsItems:res.result.goodsItems[id]
    }
  })
  
},
methods:{
 async handleScrolltolower(){
   //根据下标获取导航栏对应的页面
  const recindex =  this.recommendList[this.activeIndex]
  // 判断还有没有下一页的数据
  const {page,pages} = recindex.goodsItems
  if (page>= pages) {
    uni.showToast({title:'没有数据了',icon:'none'})
    return
  }
  const data = {
    subType:recindex.subTypes.id,
    page:page+1,
    pageSize:10
  }

  const res = await getHomeRecommend(this.currentInfo.url,data)
  // 获取新的goodsitems
  const newGoodsitems = res.result.goodsItems[recindex.subTypes.id]
  // 新的数据覆盖旧的数据  items进行新旧数据的叠加
  this.recommendList[this.activeIndex].goodsItems = {
    ...newGoodsitems,
    // 覆盖原来items的新items  ---  这个items进行新旧items的数据合并
    items:[
      ...this.recommendList[this.activeIndex].goodsItems.items,
      ...newGoodsitems.items
    ]
  }
  }

}
}
</script>

<style lang="scss">
page {
  height: 100%;
  background-color: #f4f4f4;
}
.viewport {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 180rpx 0 0;
  position: relative;
}
.cover {
  width: 750rpx;
  height: 225rpx;
  border-radius: 0 0 40rpx 40rpx;
  overflow: hidden;
  position: absolute;
  left: 0;
  top: 0;
}
.tabs {
  display: flex;
  justify-content: space-evenly;
  height: 100rpx;
  line-height: 90rpx;
  margin: 0 20rpx;
  font-size: 28rpx;
  border-radius: 10rpx;
  box-shadow: 0 4rpx 5rpx rgba(200, 200, 200, 0.3);
  color: #333;
  background-color: #fff;
  position: relative;
  z-index: 9;
  .text {
    margin: 0 20rpx;
    position: relative;
  }
  .active {
    &::after {
      content: "";
      width: 40rpx;
      height: 4rpx;
      transform: translate(-50%);
      background-color: #27ba9b;
      position: absolute;
      left: 50%;
      bottom: 24rpx;
    }
  }
}
.scroll-view {
  flex: 1;
  overflow: hidden;
}
.goods {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  padding: 0 20rpx 20rpx;
  .navigator {
    width: 345rpx;
    padding: 20rpx;
    margin-top: 20rpx;
    border-radius: 10rpx;
    background-color: #fff;
  }
  .thumb {
    width: 305rpx;
    height: 305rpx;
  }
  .name {
    height: 88rpx;
    font-size: 26rpx;
  }
  .price {
    line-height: 1;
    color: #cf4444;
    font-size: 30rpx;
  }
}
.goods .symbol,
.goods .decimal {
  font-size: 70%;
}
</style>